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Research and Links around Blockchain Technologies


Knowledge Blockchain

This research project applies blockchain technologies to Knowledge Management based on conceptual models. Models are immutably stored, shared and managed on a Knowledge Blockchain.

Knowledge Blockchain at HICSS-51
Project Website

Proof of Existence

Among the most interesting applications for blockchain technologies are existence proofs. The basic idea is to take a hash of any document – e.g. message, photo, certificate – and have it included in a timestamped block of a blockchain. Later on, a Proof of Existence can be conducted by anyone with access to the document and the blockchain, which could be public or private, by re-computing the hash value of the document. If the re-computed hash value matches the one included in the block, the prior existence of the document can be assumed, specifically at the time when the block was mined. If the hash values do not match, nothing can be deduced.

Calculation of SHA-256 values as a basic demonstration on employing hash functions
Proof of Existence at the University of Nicosia
Proof of Existence Services in Bitcoin

more to come


Block Explorers, Statistics, Full Node Software

Block Explorers

  • Blockchair – comprehensive display of block/transaction data with lots of fields, search capabilities, CSV export, API
  • Smartbit – instant search, also searches data (ASCII) included in transactions with OP_RETURN
  • – supports testnet, Litecoin and others, API
  • – supports testnet, fast and clear design, API
  • Insight – basic blockchain explorer hosted by Trezor, based on Bitcore
  • latest blocks with ASCII-representation of coinbase
  • Yogh Blockchain Reader – clear listing of blocks and transactions in hexadecimal representation


Full Node

  • Bitcoin Core is the Wallet and Full Node from the core developers
  • Bitcore-node is a full node based on Bitcore with API and block explorer
  • Bitnodes – data on full nodes with live map, API


Block Explorers, Statistics, Clients, APIs

Block Explorers

  • Etherchain – fast and clear design
  • Etherscan – transactions, pending transactions, tokens, API
  • Ethplorer – explorer and tokens monitor, API



  • Geth – “official” client written in go
  • Parity – fast, light-weight client


  • Blockcypher – transactions, contracts, events etc.
  • Etherest – API for ethereum contracts
  • Infura – platform and API
  • MyEtherAPI – network, transaction data, by

Some of the more interesting projects for enterprises

  • Hyperledger – Project of the Linux Foundation
    • Fabric – “DLT, Smart Contract Engine”, with involvement from IBM and others
    • Sawtooth – “DLT, Smart Contract Engine”, with involvement from Intel and others
    • Iroha – “DLT, Smart Contract Engine, Utility Libraries”
  • Dragonchain – open source project stemming from the Disney private blockchain platform
  • – platform for private blockchains, asset tracking
  • Microsoft – blockchain services on azure
  • IBM – services for private blockchains
  • PwC – platform with focus on Fintech
  • Deloitte – Rubix platform by Deloitte
  • Samsung SDS – Nexledger platform